Disk unit and rotating motor control apparatus for recordable optical disk unit

Abstract

A rotating motor control apparatus for a recordable optical disk unit is constructed to include a data synchronizing rotation control circuit controlling rotation of a rotating motor in synchronism with a recorded data signal, a zigzag synchronizing rotation control circuit controlling the rotation of the rotating motor in synchronism with a zigzag of a guide groove of a disk, a phase synchronizing circuit synchronizing to a phase of the data signal, and a synchronous detection circuit detecting a synchronized state of the phase synchronizing circuit and outputting a lock signal, where the data synchronizing rotation control circuit drives the rotating motor when the lock signal is obtained, and the zigzag synchronizing rotation control circuit drives the rotating motor when no lock signal is obtained.

What is claimed is:  
     
       1. A rotating motor control apparatus for a recordable optical disk unit, comprising: 
       a zigzag synchronizing rotation control circuit controlling a rotation of a rotating motor in synchronism with a zigzag of a guide groove of a disk;  
       a synchronizing signal detection circuit detecting an address synchronizing signal arranged as the zigzag of the guide groove for every predetermined distance in a linear direction of the guide groove; and  
       an address synchronizing rotation control circuit controlling the rotation of the rotating motor in synchronism with the address synchronizing signal,  
       said zigzag synchronizing rotation control circuit driving the rotating motor up to a predetermined position in front of a recording start address, and said address synchronizing rotation control circuit driving the rotating motor from the predetermined position in front of the recording start position.  
     
     
       2. The rotating motor control apparatus as claimed in claim  1 , wherein said address synchronizing rotation control circuit comprises: 
       a phase comparator comparing phases of the address synchronizing signal and a reference clock signal; and  
       a variable frequency oscillator outputting a frequency dependent on a comparison result of the phase comparator,  
       said zigzag synchronizing rotation control circuit being coupled to control the rotation of the rotating motor in synchronism with the zigzag of the guide groove by using the output of the variable frequency oscillator as a reference input.  
     
     
       3. The rotating motor control apparatus as claimed in claim  1 , wherein said zigzag synchronizing rotation control circuit drives the rotating motor after the recording ends. 
     
     
       4. A recordable optical disk unit comprising: 
       a rotating motor control apparatus comprising:  
       a zigzag synchronizing rotation control circuit controlling a rotation of a rotating motor in synchronism with a zigzag of a guide groove of a disk;  
       a synchronizing signal detection circuit detecting an address synchronizing signal arranged as the zigzag of the guide groove for every predetermined distance in a linear direction of the guide groove; and  
       an address synchronizing rotation control circuit controlling the rotation of the rotating motor in synchronism with the address synchronizing signal,  
       said zigzag synchronizing rotation control circuit driving the rotating motor up to a predetermined position in front of a recording start address, and said address synchronizing rotation control circuit driving the rotating motor from the predetermined position in front of the recording start position,  
       a data synchronizing rotation control circuit controlling the rotation of the rotating motor in synchronism with a recorded data signal;  
       a phase synchronizing circuit synchronizing to a phase of the data signal; and  
       a synchronous detection circuit detecting a synchronized state of the phase synchronizing circuit and outputting a lock signal, are built into a first digital signal processing LSI,  
       and other processing means are built into a second digital signal processing LSI.